| (19) |
 |
|
(11) |
EP 0 353 785 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
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17.04.1991 Bulletin 1991/16 |
| (43) |
Date of publication A2: |
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07.02.1990 Bulletin 1990/06 |
| (22) |
Date of filing: 21.09.1988 |
|
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| (84) |
Designated Contracting States: |
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AT BE CH DE ES FR GB GR IT LI NL SE |
| (30) |
Priority: |
21.09.1987 GB 8722148
22.08.1988 GB 8819879
|
| (62) |
Application number of the earlier application in accordance with Art. 76 EPC: |
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88308739.7 / 0309218 |
| (71) |
Applicant: IMPERIAL CHEMICAL INDUSTRIES PLC |
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London SW1P 3JF (GB) |
|
| (72) |
Inventors: |
|
- Pham, T.
B-5980 Grez-Doiceau (BE)
- Muller, L.
B-3052 Ottenburg (BE)
|
| (74) |
Representative: Baken, Philippus Johannes L. H. et al |
|
Intellectual Property Department
ICI Polyurethanes
Everslaan 45
3078 Everberg
3078 Everberg (BE) |
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| |
|
| (54) |
Manufacture of polyurethane foam |
(57) Substantially water blown flexible polyurethane slabstock foam, based on methylene
diphenyl isocyanates, having a density ranging from 15-45 kg/m³.
Such foams may be obtained through a process substantially avoiding halocarbon blowing
agents, which comprises reacting methylene diphenyl isocyanates with water and one
or more isocyanate-reactive compounds selected from polyols and polyamines with a
functionality of 2-4 and an average equivalent weight ranging from 750-5000, while
the isocyanate index ranges from 10 to 60, and weight ratio of the isocyanate-reactive
compound(s) to water is less than 20.